An outbreak of salmonellosis occurred in a group of 7 long-nosed fur seals Arctocephalus forsteri undergoing rehabilitation after being found injured and malnourished on beaches along the northern New South Wales and southern Queensland coasts of Australia. Three of the 7 individuals developed clinical disease and died within 3 d. Clinical signs included profuse diarrhea, vomiting, depression, and lethargy. Salmonella enterica subsp. enterica serovar Kentucky (S. Kentucky) was cultured from 2 of the 3 deceased animals. The other 4 animals showed similar signs and recovered following treatment. S. Kentucky (antigenic formula 8,20:i:z6) was isolated from the survivors and tissues recovered from post-mortem samples of deceased animals. The bacterium was susceptible to cephalothin and sulfamethoxazole/trimethoprim and resistant to amoxicillin-clavulanate, ampicillin/amoxicillin, tetracycline, and enrofloxacin. This organism has the potential to cause disease in aquatic wildlife, as well as posing a zoonotic threat to people who utilise the aquatic environment.
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Sci Total Environ
December 2023
NSW Department of Planning, Industry and Environment, Environment Protection Science Branch, Sydney, New South Wales, Australia. Electronic address:
Environmental pollution is a growing threat to wildlife health and biodiversity. The relationship between marine mammals and pollutants is, however, complex and as new chemicals are introduced to ecosystems alongside concomitant, interacting threats such as climate change and habitat degradation, the cumulative impact of these stressors to wildlife continues to expand. Understanding the health of wildlife populations requires a holistic approach to identify potential threatening processes.
View Article and Find Full Text PDFMar Pollut Bull
November 2022
Global Ecology, College of Science and Engineering, ARC Centre of Excellence for Australian Biodiversity and Heritage, Flinders University, Adelaide, South Australia 5001, Australia; Evolutionary Genetics Group, Department of Anthropology, University of Zurich, 8057 Zurich, Switzerland; School of Earth and Environment, University of Canterbury, 8041 Christchurch, New Zealand; Cetacean Ecology Research Group, School of Natural Sciences, Massey University, 0745 Auckland, New Zealand. Electronic address:
Dredging is an excavation activity used worldwide in marine and freshwater environments to create, deepen, and maintain waterways, harbours, channels, locks, docks, berths, river entrances, and approaches to ports and boat ramps. However, dredging impacts on marine life, including marine mammals (cetaceans, pinnipeds, and sirenians), remain largely unknown. Here we quantified the effect of dredging operations in 2005 and 2019 on the occurrence of Indo-Pacific bottlenose dolphins (Tursiops aduncus) and long-nosed fur seals (Arctocephalus forsteri) in the Port River estuary, a highly urbanized estuary in Adelaide, South Australia.
View Article and Find Full Text PDFInfect Genet Evol
October 2022
Sydney School of Veterinary Science, Faculty of Science, The University of Sydney, Camperdown, NSW, Australia. Electronic address:
Escherichia coli is a widely studied bacterium, commonly used as an indicator of faecal contamination. Investigations into the structure and diversity of E. coli in free-ranging wildlife species has been limited.
View Article and Find Full Text PDFPLoS One
February 2022
Faculty of Science, Sydney School of Veterinary Science, The University of Sydney, Sydney, New South Wales, Australia.
The rapid emergence of antimicrobial resistance (AMR) is a major concern for wildlife and ecosystem health globally. Genetic determinants of AMR have become indicators of anthropogenic pollution due to their greater association with humans and rarer presence in environments less affected by humans. The objective of this study was to determine the distribution and frequency of the class 1 integron, a genetic determinant of AMR, in both the faecal microbiome and in Escherichia coli isolated from neonates of three pinniped species.
View Article and Find Full Text PDFSci Total Environ
September 2021
Sydney School of Veterinary Science, Faculty of Science, The University of Sydney, Camperdown, NSW 2006, Australia. Electronic address:
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